A modified Johnson-Cook model for titanium matrix composites reinforced with titanium carbide particles at elevated temperatures

The dynamic properties of TiC particulate-reinforced titanium matrix composites (TiCp/Ti) prepared by pre-treatment melt process at elevated temperatures were characterized and tested by using split Hopkinson tensile bar (SHTB). The tensile properties of these materials were investigated to determine all the parameters of the Johnson-Cook constitutive mode. By considering the strain hardening and the coupled effects of temperature and strain rate, a modified Johnson-Cook constitutive model was proposed to predict the dynamic behavior of TiCp/Ti. The model predictions are in good agreement with the experimental results, which indicates that the modified model can be used to describe the flow stress for the studied composite at elevated temperatures. (C) 2013 Elsevier B.V. All rights reserved.